package online.test1;

/**
 * @Author 28021
 * @Date 2022/10/11
 */
public class test1 {
    public static void main(String[] args) {
        String a = "a";
        String b = "b";
        int[] arr={1,2,3};
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < arr.length; i++) {
            sb.append(arr[i]);
        }

        sb.toString();
        System.out.println(sb);
    }
}
